147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
/* @(#) Creates a IM_BANDFMT_FLOAT grey level image of a specified size. Range is
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* @(#) always [0,1].
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int
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* @(#) im_fgrey( image, xsize, ysize )
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* @(#) IMAGE *image;
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* @(#) int xsize, ysize;
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 02/02/1990
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* Modified on:
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* 22/7/93 JC
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* - im_outcheck() added
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* - externs removed
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* 8/2/95 JC
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* - ANSIfied
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* - im_fgrey() made from im_grey()
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* 31/8/95 JC
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* - now makes [0,1], rather than [0,256)
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* - im_grey() now defined in terms of im_fgrey()
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* 2/3/98 JC
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* - partialed
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Generate function.
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*/
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static int
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fgrey_gen( REGION *or, void *seq, void *a, void *b )
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{
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Rect *r = &or->valid;
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int le = r->left;
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int to = r->top;
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int iwm = or->im->Xsize - 1;
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int x, y;
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for( y = 0; y < r->height; y++ ) {
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float *q = (float *) IM_REGION_ADDR( or, le, y + to );
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for( x = 0; x < r->width; x++ )
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q[x] = (float) (x + le) / iwm;
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}
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return( 0 );
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}
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/* Make a one band grey ramp image.
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*/
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int
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im_fgrey( IMAGE *out, const int xsize, const int ysize )
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{
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/* Check args.
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*/
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if( xsize <=0 || ysize <= 0 ) {
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im_errormsg( "im_fgrey: bad size" );
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return( -1 );
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}
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if( im_poutcheck( out ) )
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return( -1 );
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/* Set image.
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*/
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im_initdesc( out, xsize, ysize, 1, IM_BBITS_FLOAT, IM_BANDFMT_FLOAT,
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IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 );
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/* Set hints - ANY is ok with us.
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*/
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if( im_demand_hint( out, IM_ANY, NULL ) )
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return( -1 );
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/* Generate image.
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*/
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if( im_generate( out, NULL, fgrey_gen, NULL, NULL, NULL ) )
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return( -1 );
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return( 0 );
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}
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/* As above, but make a IM_BANDFMT_UCHAR [0-255] image.
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*/
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int
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im_grey( IMAGE *image, const int xsize, const int ysize )
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{
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IMAGE *t1 = im_open_local( image, "im_grey:1", "p" );
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IMAGE *t2 = im_open_local( image, "im_grey:2", "p" );
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if( !t1 || !t2 )
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return( -1 );
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/* Change range to [0,255].
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*/
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if( im_fgrey( t1, xsize, ysize ) ||
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im_lintra( 255.0, t1, 0.0, t2 ) ||
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im_clip( t2, image ) )
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return( -1 );
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return( 0 );
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}
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